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When we tried to upgrade a listing,
we got an error.

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No such column, allowed tags.

3
00:00:05,550 --> 00:00:08,000
Let's go look at the update method.

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All database interactions are part of the
collection class so we need to look there.

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[Blank Audio] update.

6
00:00:20,970 --> 00:00:24,040
We pass the data to add a listing.

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Then we call toArray on that listening to
get the object properties as an array.

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We then loop through the array to
form the key value placeholders.

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Let's take a look at
the SQL that's generated.

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00:00:41,700 --> 00:00:43,180
And we'll just exit here.

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00:00:46,940 --> 00:00:49,577
We can see all the properties
of the parent,

12
00:00:49,577 --> 00:00:54,320
plus it added the allowed_tags property,
but not the description.

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00:00:54,320 --> 00:00:56,550
Let's go back to the premium
class properties.

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Because the description is private, and
the two-array method is on the parent,

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the parent doesn't know anything
about this private property.

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We could override the method like we
did with the set values method, but

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let's see what else we can do.

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We know that the protected
visibility works

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because the allowed tags are being added.

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So we can set the description
to protected.

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Protected will let our parent
class know about the property.

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But still keep it from being
accessed from outside the class.

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We do not want the allowed tags in our
listing so we could make that private.

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But we may want to allow
these to be overridden

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I do want to make the allowed tags
accessible without creating an object.

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So I would need to make
this property static.

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00:01:49,080 --> 00:01:51,200
So let's go ahead and
make this protected static.

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Now let's take a look
in the browser again.

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The SQL looks good, it has
the description and not the allowed tags.

30
00:02:01,920 --> 00:02:03,720
But now we're getting a notice.

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Accessing static property listing
premium allowed tags as non static.

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00:02:09,230 --> 00:02:12,080
Well that's why our
two-array actually worked.

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Because we can't access a static property

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in the same way as we
access a normal property.

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Let's update our set description method.

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To access a static property,
we need to use the keyword self,

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and then two colons, and then the
property, starting with the dollar sign.

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Let's try now.

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Great, that fixed the error,
and the SQL still looks good.

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Let's go back and remove our debugging and
see what happens.

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Great, the listing has been updated,

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but the listing page isn't
showing the description.

43
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Also, we never told the user
which tags are allowed.

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That's why I wanted
the allowed tags to be static.

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In the next video,
we'll add some finishing touches.